EP0028998A1 - Process for conditioning the slag during the refining of a metal bath - Google Patents
Process for conditioning the slag during the refining of a metal bath Download PDFInfo
- Publication number
- EP0028998A1 EP0028998A1 EP80630045A EP80630045A EP0028998A1 EP 0028998 A1 EP0028998 A1 EP 0028998A1 EP 80630045 A EP80630045 A EP 80630045A EP 80630045 A EP80630045 A EP 80630045A EP 0028998 A1 EP0028998 A1 EP 0028998A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- slag
- flow rate
- bath
- bubbling
- bubbling gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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- 239000002893 slag Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000007670 refining Methods 0.000 title claims abstract description 14
- 239000002184 metal Substances 0.000 title claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 12
- 230000003750 conditioning effect Effects 0.000 title claims abstract description 8
- 230000005587 bubbling Effects 0.000 claims abstract description 25
- 239000007789 gas Substances 0.000 claims abstract description 20
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 18
- 239000001301 oxygen Substances 0.000 claims abstract description 18
- 238000005261 decarburization Methods 0.000 claims abstract description 14
- 238000007664 blowing Methods 0.000 claims abstract description 9
- 238000005259 measurement Methods 0.000 claims abstract description 7
- 239000011261 inert gas Substances 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 5
- 230000003247 decreasing effect Effects 0.000 claims abstract description 4
- 230000023556 desulfurization Effects 0.000 claims abstract description 4
- 239000012530 fluid Substances 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims abstract description 3
- 238000002485 combustion reaction Methods 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000003517 fume Substances 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 230000001143 conditioned effect Effects 0.000 claims description 2
- 238000005187 foaming Methods 0.000 claims description 2
- 230000002706 hydrostatic effect Effects 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 230000005070 ripening Effects 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims 1
- 229910001018 Cast iron Inorganic materials 0.000 abstract description 4
- 239000002002 slurry Substances 0.000 abstract 1
- 230000002349 favourable effect Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000009257 reactivity Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000003923 scrap metal Substances 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
Definitions
- the present invention relates to a process for conditioning the slag during the refining of a metal bath, in particular of liquid iron, by blowing oxygen from the top and by bubbling with inert gas through the bottom of the crucible .
- a technique for refining cast iron by blowing oxygen from above consists in creating, during the blowing above the bath, a frothy and highly oxidized slag.
- a high height of the lance head results in a preferential oxidation of the slag which takes on a frothy consistency, which promotes dephosphorization and desulfurization.
- a low height of the lance head leads to an accelerated decarburization and to an increased release of heat, especially at the point of impact of the oxygen jet, which heat can be used for the fusion of solid materials incorporated in the bath.
- a refining process during which the interface between the metal and the slag is constantly. of inert gas so that the slag is permanently deoxidized and cannot consequently take on a frothy consistency does not, by itself, take account of the multiplicity of reactions which take place in the bath and especially in the slag.
- the slag must necessarily have an adjustable degree of reactivity as well as an essentially fluid consistency, also adjustable, to allow the refining to be carried out under conditions recognized as favorable. At the same time it is necessary to follow the momentary degree of decarburization of the bath as a function of the oxygen injected.
- the aim of the present invention was therefore to develop a process for conditioning the slag during the refining of a cast iron bath allowing the monitoring of the evolution of the thermochemical reactions taking place in the bath and in the slag, as well as the behavior of the slag from a local point of view.
- the process according to the invention which is characterized in that the consistency of the layer of slag which floats on the bath and / or the level of said slag layer is determined on the one hand as well that on the other hand the decarburization speed of the bath and that the flow rate of the bubbling gas is adjusted so as to ensure that on the one hand the level of the slag is at a determined distance from the lan ce head and that on the other hand the slag shows a fluid consistency.
- the consistency of the slag layer can be determined, for example, by measuring the intensity of the sound emitted by the blowing lance and an indication of the level of the slag layer can be obtained by measuring hydrostatic pressures prevailing at different levels of the crucible wall.
- the composition of the converter fumes can be determined continuously, preferably using a mass spectrometer.
- the oxygen blown between the metal and the slag is divided according to the invention by increasing, according to the measurement results, the flow rate of the bubbling gas for deoxidizing the slag and decreasing said flow to promote oxidation of the slag.
- the flow rate of the bubbling gas varies between 0 and 0.3 Nm 3 / t-minute.
- the process according to the invention provides that the lance is practically confined in a role of simple oxygen supplier and that the rate of decarburization of the metal by the flow of the bubbling gas.
- the decarburization speed is increased by increasing the flow rate of the bubbling gas and it is braked by decreasing said flow rate, as indicated by the measuring devices.
- the deoxidation of the slag which is carried out by means of an increase in the flow rate of the bubbling gas, is carried out in part by the accelerated combustion of the carbon which is transported using the bubbling gas to the slag more or less oxidized.
- the slag is conditioned according to the invention in the sense that the bubbling with inert gas is stopped, so that the slag rises, which is favorable with a view to scrubbing.
Abstract
Un procédé de conditionnement de la scorie au cours de l'affinage d'un bain de métal, en particulier de fonte liquide, par soufflage d'oxygène par le haut et par barbotage au gaz inerte par le fond du creuset, prévoit que l'on détermine en continu d'une part la consistance de la couche de scorie qui surnage au bain et/ou le niveau de ladite couche de scorie ainsi que d'autre part la vitesse de décarburation du bain et que l'on ajuste le débit du gaz de barbotage de manière à assurer que d'une part le niveau de la scorie se trouve à une distance déterminée vis-à-vis de la tête de lance et que d'autre part la scorie accuse une consistance fluide. On partage l'oxygène insufflé entre le métal et la scorie, en augmentant suivant les résultats de mesure le débit du gaz de barbotage pour désoxyder la scorie et en diminuant ledit débit pour oxyder la scorie, le débit du gaz de barbotage pouvant varier de 0 à 0,3 Nm³/t-min. Ainsi on arrive à gouverner la vitesse de décarburation et les réactions de déphosphoration et de désulfuration.A process for conditioning the slag during the refining of a metal bath, in particular of liquid cast iron, by blowing oxygen from the top and by bubbling with inert gas from the bottom of the crucible, provides that the the consistency of the slag layer which floats in the bath and / or the level of the said slag layer is determined continuously on the one hand and the decarburization speed of the bath on the other hand and the flow rate of the slurry is adjusted bubbling gas so as to ensure that on the one hand the level of the slag is at a determined distance from the lance head and that on the other hand the slag shows a fluid consistency. The insufflated oxygen is divided between the metal and the slag, increasing according to the results of measurement the flow rate of the bubbling gas to deoxidize the slag and decreasing said flow rate to oxidize the slag, the flow rate of the bubbling gas being able to vary by 0 at 0.3 Nm³ / t-min. Thus one arrives at governing the speed of decarburization and the reactions of dephosphoration and desulfurization.
Description
La présente invention concerne un procédé pour le conditionnement de la scorie au cours de l'affinage d'un bain de métal, en particulier de fonte liquide, par soufflage d'oxygène par le haut et par barbotage au gaz inerte par le fond du creuset.The present invention relates to a process for conditioning the slag during the refining of a metal bath, in particular of liquid iron, by blowing oxygen from the top and by bubbling with inert gas through the bottom of the crucible .
Les impératifs de la productivité amènent l'aciériste à rechercher d'un côté des moyens permettant d'incorporer un maximum de matières ferrifères dans le bain, telles les mitrailles et/ou les minerais riches. D'un autre côté on cherche à assurer une qualité élevée de l'acier fabriqué en éliminant le plus possible de phosphore et de soufre contenus dans le métal à affiner.The imperatives of productivity lead the steelmaker to look on the one hand for means allowing the incorporation of a maximum of ferrous materials in the bath, such as scrap metal and / or rich ores. On the other hand, we seek to ensure a high quality of the steel produced by eliminating as much of the phosphorus and sulfur contained in the metal to be refined.
Pour arriver à ce double but il est connu de suivre dans la mesure du possible, l'évolution de la scorie au cours de l'affinage et d'intervenir par des réglages soit du débit de l'oxygène soufflé par la lance, soit de la hauteur de la tête de lance au-dessus du niveau du bain.To achieve this double goal it is known to follow as much as possible, the evolution of the slag during the refining and to intervene by adjustments either of the flow of oxygen blown by the lance, or of the height of the lance head above the level of the bath.
En effet une technique d'affinage de fonte par soufflage d'oxygène par le haut consiste à créer au cours du soufflage au-dessus du bain une scorie mousseuse et fortement oxydée. On peut dans une certaine mesure régler la répartition de l'oxygène de soufflage entre la scorie et le métal en variant la distance entre la tête de lance et le niveau du bain, pour un débit constant en oxygène et pour une tête de lance d'une configuration donnée.In fact, a technique for refining cast iron by blowing oxygen from above consists in creating, during the blowing above the bath, a frothy and highly oxidized slag. We can to a certain extent adjust the distribution of the blowing oxygen between the slag and the metal by varying the distance between the lance head and the bath level, for a constant oxygen flow and for a lance head. a given configuration.
Une hauteur élevée de la tête de lance résulte en une oxydation préférentielle de la scorie qui prend une consistance mousseuse, ce qui favorise la déphosphoration et la désulfuration. Par contre une faible hauteur de la tête de lance conduit à une décarburation accélérée et à un dégagement accru de chaleur, surtout au point d'impact du jet d'oxygène, laquelle chaleur peut servir à la fusion de matières solides incorporées au bain.A high height of the lance head results in a preferential oxidation of the slag which takes on a frothy consistency, which promotes dephosphorization and desulfurization. On the other hand, a low height of the lance head leads to an accelerated decarburization and to an increased release of heat, especially at the point of impact of the oxygen jet, which heat can be used for the fusion of solid materials incorporated in the bath.
Or, malgré l'acquisition de lances spéciales onéreuses en vue d'augmenter le taux de post-combustion du CO près de la surface du bain, tous les efforts imaginables pour augmenter les températures près de la surface du bain dans le but de fondre un surplus de mitrailles, sont contre-carrés par la présence à la surface du bain d'une couche de scorie épaisse et mousseuse qui se forme au cours de l'affinage par soufflage d'oxygène par le haut et qui agit comme un isolant thermique grâce à sa consistance mousseuse.However, despite the acquisition of expensive special lances in order to increase the CO post-combustion rate near the surface of the bath, every effort imaginable to increase the temperatures near the surface of the bath in order to melt a surplus scrap, are counter-square by the presence on the surface of the bath of a layer of thick and frothy slag which is formed during the refining by blowing oxygen from above and which acts as a thermal insulator thanks to its frothy consistency.
C'est dans cet ordre d'idées que le déposant a proposé un procédé d'affinage permettant d'augmenter les taux traditionnels d'ajoutes de mitrailles solides tout en évitant les désavantages décrits.It is in this context that the applicant has proposed a refining process which makes it possible to increase the traditional rates of addition of solid machine-gun scrap while avoiding the disadvantages described.
Le procédé décrit dans la demande de brevet LU 81.207, prévoit d'affiner la fonte par soufflage d'oxygène par le haut-et il est caractérisé en ce que d'une part on provoque à proximité immédiate de la surface du bain une post-combustion du CO dégagé au cours de la décarburation en répartissant de l'oxygène sur ladite surface et que d'autre part on règle l'épaisseur et la consistance de la scorie en agissant sur le déséquilibre entre celle-ci et le bain, par injection de gaz essentiellement inerte par le fond du bain.The process described in patent application LU 81.207 provides for refining the cast iron by blowing oxygen from above and it is characterized in that, on the one hand, there is caused in the immediate vicinity of the surface of the bath a post - combustion of the CO released during decarburization by distributing oxygen over said surface and, on the other hand, the thickness and the consistency of the slag are regulated by acting on the imbalance between it and the bath, by injection essentially inert gas from the bottom of the bath.
Toutefois un procédé d'affinage au cours duquel l'interface entre le métal et la scorie est constamment. de gaz inerte si bien que la scorie est en permanence désoxydée et ne peut par conséquence prendre une consistance mousseuse, ne permet pas, à lui seul, de tenir compte de la multiplicité des réactions qui se déroulent dans le bain et surtout dans la scorie. En effet, la scorie doit nécessairement présenter un degré de réactivité réglable ainsi qu'une consistance essentiellement fluide, également réglable, pour permettre la conduite de l'affinage sous des conditions reconnues comme favorables. En même temps il est nécessaire de suivre le degré momentané de décarburation du bain en fonction de l'oxygène insufflé.However, a refining process during which the interface between the metal and the slag is constantly. of inert gas so that the slag is permanently deoxidized and cannot consequently take on a frothy consistency, does not, by itself, take account of the multiplicity of reactions which take place in the bath and especially in the slag. In fact, the slag must necessarily have an adjustable degree of reactivity as well as an essentially fluid consistency, also adjustable, to allow the refining to be carried out under conditions recognized as favorable. At the same time it is necessary to follow the momentary degree of decarburization of the bath as a function of the oxygen injected.
Le but de la présente invention était donc d'élaborer un procédé de conditionnement de la scorie au cours de l'affinage d'un bain de fonte permettant le suivi de l'évolution des réactions thermo- chimiques se déroulant dans le bain et dans la scorie, ainsi que du comportement de la scorie au point de vue local.The aim of the present invention was therefore to develop a process for conditioning the slag during the refining of a cast iron bath allowing the monitoring of the evolution of the thermochemical reactions taking place in the bath and in the slag, as well as the behavior of the slag from a local point of view.
Ce but est atteint par le procédé suivant l'invention qui est caractérisé en ce que l'on détermine en continu d'une part la consistance de la couche de scorie qui surnage au bain et/ou le niveau de ladite couche de scorie, ainsi que d'autre part la vitesse de décarburation du bain et que l'on ajuste le débit du gaz de barbotage de manière à assurer que d'une part le niveau de la scorie se trouve à une distance déterminée vis-à-vis de la tête de lan ce et que d'autre part la scorie accuse une consistance fluide.This object is achieved by the process according to the invention which is characterized in that the consistency of the layer of slag which floats on the bath and / or the level of said slag layer is determined on the one hand as well that on the other hand the decarburization speed of the bath and that the flow rate of the bubbling gas is adjusted so as to ensure that on the one hand the level of the slag is at a determined distance from the lan ce head and that on the other hand the slag shows a fluid consistency.
On peut déterminer la consistance de la couche de scorie p.ex. par l'intermédiaire de la mesure de l'intensité du son émis par la lance de soufflage et on peut obtenir une indication sur le niveau de la couche de scorie par la mesure des pressions hydrostatiques qui règnent à différents niveaux de la paroi du creuset. Pour suivre la vitesse de décarburation du bain on peut déterminer en continu la composition des fumées de convertisseur, de préférence à l'aide d'un spectromètre de masse.The consistency of the slag layer can be determined, for example, by measuring the intensity of the sound emitted by the blowing lance and an indication of the level of the slag layer can be obtained by measuring hydrostatic pressures prevailing at different levels of the crucible wall. To monitor the decarburization speed of the bath, the composition of the converter fumes can be determined continuously, preferably using a mass spectrometer.
L'idée qui est à la base de la présente invention peut s'énoncer comme suit : Il existe un conditionnement optimum de la scorie au point de vue consistance et réactivité, qui résulte en une combinaison favorable des effets de post-combustion de CO et de déphosphoration-désulfuration. Il devrait donc être possible de conditionner la scorie, en réglant le débit de gaz de barbotage, sous condition de disposer de moyens de mesure qui permettent un suivi du comportement local de cette scorie, c.à.d. de son épaisseur ainsi que de son niveau dans le creuset.The idea which is the basis of the present invention can be stated as follows: There is an optimum conditioning of the slag from the point of view of consistency and reactivity, which results in a favorable combination of the post-combustion effects of CO and dephosphoration-desulfurization. It should therefore be possible to condition the slag by regulating the flow of bubbling gas, under the condition of having measurement means which allow monitoring of the local behavior of this slag, i.e. its thickness as well as its level in the crucible.
Tout en maintenant la distance entre la tête de lance et la scorie à une valeur déterminée, on partage suivant l'invention l'oxygène insufflé entre le métal et la scorie en augmentant, suivant les résultats de mesure, le débit du gaz de barbotage pour désoxyder la scorie et en diminuant ledit débit pour favoriser l'oxydation de la scorie. Le débit du gaz de barbotage varie entre 0 et 0,3 Nm3/t-minute.While maintaining the distance between the lance head and the slag at a determined value, the oxygen blown between the metal and the slag is divided according to the invention by increasing, according to the measurement results, the flow rate of the bubbling gas for deoxidizing the slag and decreasing said flow to promote oxidation of the slag. The flow rate of the bubbling gas varies between 0 and 0.3 Nm 3 / t-minute.
On se rend compte qu'en désoxydant la scorie par augmentation du débit du gaz de barbotage, on favorise la post-combustion du CO. dégagé au cours de l'affinage, au-dessus du niveau du bain. Il est donc possible d'agir sur les conditions thermiques régnant au-dessus du niveau de bain par conditionnement de la scorie, à l'aide du réglage du débit du gaz de barbotage.We realize that by deoxidizing the slag by increasing the flow rate of the bubbling gas, we promote the post-combustion of CO. released during ripening, above bath level. It is therefore possible to act on the thermal conditions prevailing above the bath level by conditioning the slag, using the adjustment of the flow rate of the bubbling gas.
Dans le même ordre d'idées on peut, suivant l'invention, provoquer une réaction de déphosphoration et de désulfuration du bain en formant, par réglage du débit du gaz de barbotage, une scorie réactive,non mousseuse. En effet,une diminution du dit débit permet l'oxydation de la scorie,condition pour en augmenter la réactivité.In the same vein, it is possible, according to the invention, to cause a reaction of dephosphorization and desulfurization of the bath by forming, by adjusting the flow rate of the bubbling gas, a reactive, non-foaming slag. In fact, a reduction in said flow rate allows oxidation of the slag, a condition for increasing its reactivity.
Alors que suivant les procédés d'affinage conventionnels on essaie de contrôler tant bien que mal la vitesse de décarburation du bain par le débit d'oxygène insufflé, par l'ajustement de la hauteur de la lanee et encore en prévoyant des têtes de lance à l'aide desquelles on peut choisir l'angle d'insufflation de l'oxygène, le procédé suivant l'invention prévoit que l'on confine la lance pratiquement dans, un rôle de simple fournisseur d'oxygène et que l'on règle la vitesse de décarburation du métal par le débit du gaz de barbotage.While following conventional refining methods, we try to control the decarburization speed of the bath as best as possible by the flow of oxygen supplied, by adjusting the height of the lane and again by providing lance heads to Using which one can choose the oxygen insufflation angle, the process according to the invention provides that the lance is practically confined in a role of simple oxygen supplier and that the rate of decarburization of the metal by the flow of the bubbling gas.
En effet, on augmente la vitesse de décarburation en augmentant le débit du gaz de barbotage et on la freine en diminuant ledit débit, suivant les indications des dispositifs de mesure.In fact, the decarburization speed is increased by increasing the flow rate of the bubbling gas and it is braked by decreasing said flow rate, as indicated by the measuring devices.
Ainsi il s'est avéré que l'on peut agir sur la vitesse de décarburation par conditionnement de la scorie. En effet, la désoxydation de la scorie qui est effectuée par voie d'une augmentation du débit du gaz de barbotage, est effectuée en partie par la combustion accélérée du carbone que l'on transporte à l'aide du gaz de barbotage vers la scorie plus ou moins oxydée.Thus it turned out that one can act on the speed of decarburization by conditioning the slag. Indeed, the deoxidation of the slag which is carried out by means of an increase in the flow rate of the bubbling gas, is carried out in part by the accelerated combustion of the carbon which is transported using the bubbling gas to the slag more or less oxidized.
En fin de l'élaboration on conditionne suivant l'invention la scorie dans ce sens que l'on arrête le barbotage au gaz inerte, si bien que la scorie monte, ce qui est favorable en vue du décrassage.At the end of the preparation, the slag is conditioned according to the invention in the sense that the bubbling with inert gas is stopped, so that the slag rises, which is favorable with a view to scrubbing.
Pour ce qui est.des mesures qui sont effectuées suivant l'inven- .tion et grâce auxquelles on détermine en continu la consistance de la couche de scorie et la hauteur de son niveau dans le creuset, on utilise de préférence les procédés et dispositifs de mesure que le déposant a décrits dans le brevet LU 71.261 resp. la demande de brevet LU 81.512.As regards the measurements which are carried out according to the invention and by means of which the consistency of the slag layer and the height of its level in the crucible are continuously determined, the methods and devices of preference are used. measurement that the applicant has described in patent LU 71,261 resp. patent application LU 81.512.
Ces procédés et dispositifs se prêtent particulièrement bien à être intégrés dans un système global de conduite par ordinateur, tel qu'il convient d'utiliser dans le cadre du procédé suivant l'invention. Il en est de même pour ce qui est du suivi de la vitesse de décarburation par analyse en continu des fumées du convertisseur à l'aide d'un spectromètre de masse.These methods and devices lend themselves particularly well to being integrated into a global computer control system, such as should be used in the context of the method according to the invention. The same applies to the monitoring of the decarburization speed by continuous analysis of the fumes from the converter using a mass spectrometer.
Claims (7)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU81859 | 1979-11-07 | ||
| LU81859A LU81859A1 (en) | 1979-11-07 | 1979-11-07 | PROCESS FOR CONDITIONING SLAG DURING REFINING OF A METAL BATH |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0028998A1 true EP0028998A1 (en) | 1981-05-20 |
Family
ID=19729283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP80630045A Ceased EP0028998A1 (en) | 1979-11-07 | 1980-10-16 | Process for conditioning the slag during the refining of a metal bath |
Country Status (13)
| Country | Link |
|---|---|
| US (2) | US4325730A (en) |
| EP (1) | EP0028998A1 (en) |
| JP (1) | JPS5690918A (en) |
| AU (1) | AU531565B2 (en) |
| BR (1) | BR8007220A (en) |
| CA (1) | CA1159651A (en) |
| ES (1) | ES496609A0 (en) |
| IN (1) | IN154855B (en) |
| LU (1) | LU81859A1 (en) |
| PL (1) | PL227707A1 (en) |
| PT (1) | PT71997B (en) |
| RO (1) | RO81380B (en) |
| ZA (1) | ZA806905B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0084288A1 (en) * | 1981-12-09 | 1983-07-27 | Arbed S.A. | Method and apparatus for the direct production of liquid iron |
| EP0086732A1 (en) * | 1982-02-17 | 1983-08-24 | Arbed S.A. | Process for increasing the batches of coolants during the refining of steel by the BOF process |
| EP0107609A1 (en) * | 1982-09-27 | 1984-05-02 | Arbed S.A. | Process and installation for heating-up a scrap-charged steel bath |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5893809A (en) * | 1981-11-30 | 1983-06-03 | Daido Steel Co Ltd | Refining method for molten steel |
| NL8201269A (en) * | 1982-03-26 | 1983-10-17 | Hoogovens Groep Bv | METHOD FOR MANUFACTURING STEEL IN A CONVERTER FROM CRUDE IRON AND SCRAP. |
| ZA835649B (en) * | 1982-08-25 | 1984-04-25 | British Steel Corp | Lancing in electric arc steelmaking |
| US4529442A (en) * | 1984-04-26 | 1985-07-16 | Allegheny Ludlum Steel Corporation | Method for producing steel in a top oxygen blown vessel |
| JPS60230929A (en) * | 1984-04-27 | 1985-11-16 | Nippon Steel Corp | Method for operating converter |
| AU558925B2 (en) * | 1984-04-27 | 1987-02-12 | Nippon Steel Corporation | Monitoring and controlling the slag-forming conditions in the basic oxygen steel converter |
| SE8800321D0 (en) * | 1987-08-20 | 1988-02-02 | Scandinavian Emission Tech | METALLURGICAL CONTROL METHOD |
| AT392801B (en) * | 1989-06-05 | 1991-06-25 | Voest Alpine Ind Anlagen | METHOD FOR SLAG GUIDANCE IN A PALE STEEL CONVERTER |
| US5584909A (en) * | 1995-01-19 | 1996-12-17 | Ltv Steel Company, Inc. | Controlled foamy slag process |
| US5885322A (en) * | 1996-03-22 | 1999-03-23 | Steel Technology Corporation | Method for reducing iron losses in an iron smelting process |
| AU696273B2 (en) | 1996-03-22 | 1998-09-03 | Steel Technology Corporation | Stable operation of a smelter reactor |
| US6309442B1 (en) | 2000-02-25 | 2001-10-30 | John D. Usher | Refractory material sensor for determining level of molten metal and slag and method of using |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU69388A1 (en) * | 1973-02-15 | 1974-05-29 |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT297073B (en) * | 1969-04-15 | 1972-03-10 | Voest Ag | Method for measuring the thickness of the slag layer on metallic baths, in particular on melts to be degassed by vacuum treatment |
| BE755456A (en) * | 1969-08-29 | 1971-03-01 | Allegheny Ludlum Ind Inc | DECARBURATION OF MELT STEEL |
| US3719469A (en) * | 1970-07-22 | 1973-03-06 | Allegheny Ludlum Ind Inc | Control for basic oxygen steelmaking furnace |
| JPS5129692B2 (en) * | 1972-06-24 | 1976-08-27 | ||
| JPS5335764B2 (en) * | 1972-10-06 | 1978-09-28 | ||
| US4047937A (en) * | 1972-12-04 | 1977-09-13 | United States Steel Corporation | Method for controlling the operation of a steel refining converter |
| US4197116A (en) * | 1973-03-30 | 1980-04-08 | United States Steel Corporation | Method and apparatus for automatically controlling the rate of flux injection to a converter |
| US3854932A (en) * | 1973-06-18 | 1974-12-17 | Allegheny Ludlum Ind Inc | Process for production of stainless steel |
| US4195985A (en) * | 1977-12-10 | 1980-04-01 | Eisenwerk-Gesellschaft Maximilianshutte Mbh. | Method of improvement of the heat-balance in the refining of steel |
-
1979
- 1979-11-07 LU LU81859A patent/LU81859A1/en unknown
-
1980
- 1980-10-16 EP EP80630045A patent/EP0028998A1/en not_active Ceased
- 1980-10-30 PT PT71997A patent/PT71997B/en unknown
- 1980-11-05 JP JP15477380A patent/JPS5690918A/en active Pending
- 1980-11-06 PL PL22770780A patent/PL227707A1/xx unknown
- 1980-11-06 IN IN798/DEL/80A patent/IN154855B/en unknown
- 1980-11-06 AU AU64124/80A patent/AU531565B2/en not_active Ceased
- 1980-11-06 BR BR8007220A patent/BR8007220A/en not_active IP Right Cessation
- 1980-11-06 US US06/204,537 patent/US4325730A/en not_active Expired - Lifetime
- 1980-11-06 ES ES496609A patent/ES496609A0/en active Granted
- 1980-11-07 ZA ZA00806905A patent/ZA806905B/en unknown
- 1980-11-07 RO RO102526A patent/RO81380B/en unknown
- 1980-11-07 CA CA000364220A patent/CA1159651A/en not_active Expired
-
1981
- 1981-05-04 US US06/261,509 patent/US4345746A/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU69388A1 (en) * | 1973-02-15 | 1974-05-29 |
Non-Patent Citations (1)
| Title |
|---|
| REVUE DE METALLURGIE, Vol. 75, No. 6, 1978, pages 415-426 G. DENIER, H. GAYE: "Nouvelles perspectives de l'affinage LD-etudes physico-chimiques et tests a l'echelle pilote" * Page 417 * * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0084288A1 (en) * | 1981-12-09 | 1983-07-27 | Arbed S.A. | Method and apparatus for the direct production of liquid iron |
| EP0086732A1 (en) * | 1982-02-17 | 1983-08-24 | Arbed S.A. | Process for increasing the batches of coolants during the refining of steel by the BOF process |
| EP0107609A1 (en) * | 1982-09-27 | 1984-05-02 | Arbed S.A. | Process and installation for heating-up a scrap-charged steel bath |
Also Published As
| Publication number | Publication date |
|---|---|
| AU531565B2 (en) | 1983-08-25 |
| BR8007220A (en) | 1981-05-12 |
| IN154855B (en) | 1984-12-15 |
| JPS5690918A (en) | 1981-07-23 |
| PT71997B (en) | 1981-08-31 |
| RO81380A (en) | 1983-04-29 |
| LU81859A1 (en) | 1981-06-04 |
| AU6412480A (en) | 1981-05-14 |
| CA1159651A (en) | 1984-01-03 |
| ES8107316A1 (en) | 1981-10-01 |
| US4325730A (en) | 1982-04-20 |
| PT71997A (en) | 1980-11-01 |
| ZA806905B (en) | 1981-10-28 |
| US4345746A (en) | 1982-08-24 |
| ES496609A0 (en) | 1981-10-01 |
| PL227707A1 (en) | 1981-08-21 |
| RO81380B (en) | 1983-04-30 |
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Inventor name: HENRION, ROMAIN Inventor name: BAUMERT, JEAN Inventor name: LORANG, LUCIEN Inventor name: SCHLEIMER, FRANCOIS Inventor name: GOEDERT, FERDINAND |